I took 20mg of Prozac (fluoxetine) for 4 days I have been off of it for 6 days How long does it take to get out of my system? I've had heart palpitations all day

2-4 weeks. half-life of prozac (fluoxetine) is about 3 days, multiply it by 5, it is about 2 weeks to bring Prozac (fluoxetine) blood concentration to a barely detectable level... but to avoid any drug-to-drug interactions, I'd advice to wait for 4 weeks.